Two-stroke explosion engine



Ap f 1.4, 1925 4.05 cosMQ TWO-STROKE EXPLOSION ENGINE Fi led Jxm' 6, 192 3 2 Sheets-Shoot 2 Izwezviaze d/ Cosmo, 31

Patented Apr, 14,1925a l UNITED STATES JOSEPH DE C'OS MO, F NEUILLYSUR SEINE, FRANCE.

TWO-STROKE EXPLOSION ENGINE.

Application filed June 6,

Z 0 all whom it may 0071062W Be it known that 1, Josnrrr on Cosmo, a

' subject of the King of Italy, residing in Neuilly sur Seine, 89 Avenue de lieuilly, in the Republic of France, have invented certain new and usetul Improvements in TWo- Stroke Explosion Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reterence being had to the accompanying drawings, and to letters or figures of reference marked therein, which form a part of this specification.

My invention consists essentially in an improvement to the two-stroke explosion engine of the type wherein in the liner surmounting thedriving piston moves a special scavenging piston, so as (:lescribed in my Patent No. 1313,97 1.

In the driving piston, I provide a space or chamber, closed by a valve, 01' valves, or like device, so that the fresh gases are first admitted in this space, before they are compressed between the driving and scavenging pistons, in order to prevent any loss of fuel.

In the acconipanying drawing, Figure 1 is a vertical section on the line A-B 01? Figure 2, sl'iowing an engine with two cylinders. Figure 2 a vertical section on the .line

L 1) of Figure 1. Figure 3 is a horizontal section above the driving uiechanisn'i ot the scavenging piston.

ei erring to Figures 1, 9. and 8, 1 is the cylinder with the head 2; 3 is the crank pin; a, the driving piston surmounted by the liner 5; 6, the connecting rod; 7, the scavenging piston; 8, the annular valves of the pistons with their guide-covers 9.

10 is the rod of the scavenging piston; 11, the first admission chamber in the driving piston; 12, the overflow space; 13, the compression and explosion chamber.

1% and 15 ar -the governing cams of the scavenging piston and are carried by the crank 1. F or the ascent and the descent of the scavenging piston, these cams act upon. the rollers 20, which are supported by arms 1923. Serial No. 643,701.

18 and 19 fixed to a collar 16 mounted upon an axle 9.1. The lever 16 carries a third arm 17 sliding in a slot made in the lower part of the piston rod 10 of the scavenging piston.

The fresh gases are first admitted in the chamber 11, disposed in the head of the driving piston 41; and separated from the overflow space 12 by the valve 8, which is closed during the ascent of the scavenging piston and closed as soon as the last descents.

When the scavenging piston has finished his ascending stroke, the fuel has flowed into the compression chamber 13, and the pistons t and 7, both as if forming a single piston only, while ascending, compress the gases. In this position, the compression chamber is separated from the admission chamber by two superposed valves 8, one on the head of the driving piston, the other on the scavenging piston.

By means of this construction, no loss of fuel can be produced. and the etilciency ot the motor is increased. l urthermore, there is no back-fire to the carburettor and so any return shock on the handle is prevented.

Having thus fully described my invention, what I desire to claim and secure by Letters Patent, is i In a two-stroke explosion engine, a cylinder having intake ports, a distributing piston in said cylinder,-a scavenging piston in said cylinder movable relatively to the distributing piston, valves in both oi. said pistons, said distributing piston having an internal chamber adapted to crnnmunicate directly with the intake ports'ot the cylinder, a transfer cl'iamber arranged between said pistons, the valves in the distributing piston permitting a fuel mixture from the intake ports to pass into the t 'anst'er chamber, and means for moving the pistons relatively to one another to cause the scavenging piston to draw the fuel mixture into the transfer chamber.

In testimony that I claim the foregoing as my invention, 1 have signed my name. A

JOSEPH on OOSMO. 

